Bismarck, N.D.—The company that operates the Dakota Access oil pipeline is asking the U.S. Supreme Court to reverse an appellate ruling ordering additional environmental review, saying it puts the line at risk of being shut down. A Washington, D.C., Circuit Court of Appeals panel earlier this year supported the Standing Rock Sioux and other tribes’ argument that the project deserves a thorough environmental review and is currently operating without a key federal permit. The study will determine whether the U.S. Army Corps of Engineers reissues a permit for the line to cross the Missouri River in south-central North Dakota. Texas-based Energy Transfer, which operates the $3.8 billion, 1,172-mile (1,886 kilometer) pipeline, said in a filing Monday to the Supreme Court that the appeals court decision creates uncertainty for the pipeline and puts it “at a significant risk of being shut down, which would precipitate serious economic and environmental consequences.” Standing …